CN113281693B - Method and system for improving performance parameters and consistency of current transformer - Google Patents
Method and system for improving performance parameters and consistency of current transformer Download PDFInfo
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- CN113281693B CN113281693B CN202110500528.5A CN202110500528A CN113281693B CN 113281693 B CN113281693 B CN 113281693B CN 202110500528 A CN202110500528 A CN 202110500528A CN 113281693 B CN113281693 B CN 113281693B
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005259 measurement Methods 0.000 claims abstract description 51
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 238000004891 communication Methods 0.000 claims abstract description 8
- 238000011056 performance test Methods 0.000 claims abstract description 5
- 238000012360 testing method Methods 0.000 claims description 7
- 239000000758 substrate Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 12
- 238000004590 computer program Methods 0.000 description 7
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 230000006870 function Effects 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002707 nanocrystalline material Substances 0.000 description 4
- 238000012545 processing Methods 0.000 description 4
- 230000035699 permeability Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000001939 inductive effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/02—Testing or calibrating of apparatus covered by the other groups of this subclass of auxiliary devices, e.g. of instrument transformers according to prescribed transformation ratio, phase angle, or wattage rating
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- Measuring Instrument Details And Bridges, And Automatic Balancing Devices (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The application discloses a method and a system for improving performance parameters and consistency of a current transformer, wherein the method comprises the following steps: the method comprises the steps of uniformly prescribing performance parameters of a current transformer; calibrating a measurement module by using a standard source and a current transformer with the precision performance higher than the precision grade of the measurement module by a preset multiple, and marking the communication address of the current transformer in the measurement module; performing performance test on upper limit parameters and lower limit parameters of the current transformer which are uniformly regulated by the performance parameters; and inserting or replacing the measuring module to complete the field replacement of the measuring module.
Description
Technical Field
The application relates to the technical field of power systems, in particular to a method and a system for improving performance parameters and consistency of a current transformer.
Background
Due to factors such as quality problems of the measuring module, influence of using environment, improper using method and the like, the measuring module is out of alignment or damaged, and the measuring module needs to be replaced. The measuring module is split, the current transformer in the body is required to be matched with the parameters of the measuring module, and the parameter performance and consistency of the transformer are required.
Disclosure of Invention
The embodiment of the disclosure provides a method and a system for improving performance parameters and consistency of a current transformer, which at least solve the technical problems in the prior art that a measurement module is misaligned or damaged due to factors such as quality problems of the measurement module, influence of use environment, improper use method and the like, and the measurement module needs to be replaced.
According to one aspect of the disclosed embodiments, there is provided a method for improving performance parameters and consistency of a current transformer, including: the method comprises the steps of uniformly prescribing performance parameters of a current transformer; calibrating a measurement module by using a standard source and a current transformer with the precision performance higher than the precision grade of the measurement module by a preset multiple, and marking the communication address of the current transformer in the measurement module; performing performance test on upper limit parameters and lower limit parameters of the current transformer which are uniformly regulated by the performance parameters; and inserting or replacing the measuring module to complete the field replacement of the measuring module.
According to another aspect of the embodiments of the present disclosure, there is also provided a system for improving performance parameters and consistency of a current transformer, including: the specified performance parameter module is used for uniformly specifying the performance parameters of the current transformer; the calibration measurement module is used for calibrating the measurement module by utilizing a standard source and a current transformer with the precision performance higher than the precision grade of the measurement module by a preset multiple, and identifying the communication address of the current transformer in the measurement module; the upper and lower limit parameter testing module is used for performing performance testing on upper limit parameters and lower limit parameters of the current transformer which are uniformly regulated by the performance parameters; and inserting a replacement measurement module for inserting or replacing the measurement module to complete the field replacement of the measurement module.
In the invention, the invention provides the influence on the accuracy of the split measuring module on the parameter performance of the current transformer, and compared with the prior art, the invention has the following beneficial effects: the measurement module does not need to be powered off to support hot plug. The problem of on-site current transformer and measurement module matching calibration is solved. Quick replacement, plug and play. The current transformer has high performance and high consistency. And actively reporting the replacement information.
Drawings
The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this application, illustrate embodiments of the disclosure and together with the description serve to explain the disclosure and do not constitute an undue limitation on the disclosure. In the drawings:
FIG. 1 is a schematic diagram of a method of improving current transformer performance parameters and consistency according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a MATS-2010S soft magnetic material test according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of error accuracy at normal temperature for a current transformer according to an embodiment of the disclosure;
FIG. 4 is a schematic diagram of different temperature errors of a current transformer according to an embodiment of the present disclosure;
FIG. 5 is a system flow diagram according to an embodiment of the present disclosure;
fig. 6 is a schematic diagram of a system for improving performance parameters and consistency of a current transformer according to an embodiment of the present disclosure.
Detailed Description
The exemplary embodiments of the present invention will now be described with reference to the accompanying drawings, however, the present invention may be embodied in many different forms and is not limited to the examples described herein, which are provided to fully and completely disclose the present invention and fully convey the scope of the invention to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the accompanying drawings is not intended to be limiting of the invention. In the drawings, like elements/components are referred to by like reference numerals.
Unless otherwise indicated, terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art. In addition, it will be understood that terms defined in commonly used dictionaries should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense.
According to a first aspect of the present embodiment, there is provided a method 100 for improving performance parameters and consistency of a current transformer, the method 100 comprising:
s102, uniformly prescribing performance parameters of the current transformer;
s104, calibrating a measurement module by using a standard source and a current transformer with the precision performance higher than the precision grade of the measurement module by a preset multiple, and marking the communication address of the current transformer in the measurement module;
s106, performing performance test on upper limit parameters and lower limit parameters of the current transformer which are uniformly regulated by the performance parameters;
s108, inserting or replacing the measuring module to finish the field replacement of the measuring module.
Specifically, the embodiment relates to the influence of the parameter performance of the current transformer on the accuracy of the split measurement module, and is mainly applied to the thermal magnetic circuit breaker or the isolating switch as a main body, and the measurement module capable of being hot-plugged is plugged into the thermal magnetic circuit breaker or the isolating switch body.
Regarding the influence of the parameter performance of the current transformer on the accuracy of the split measuring module, another purpose is to theoretically calculate and support the parameter performance of the transformer required by the split measuring module, such as the information of the ratio difference, the angle difference and the like of the current transformer.
Regarding the influence of the parameter performance of the current transformer on the accuracy of the split measuring module, another purpose of the method is to improve the consistency of the transformer manufacture from the perspective of the transformer production process.
In the practical use process of the embodiment, the mutual inductor matched with the measuring module adopts the following steps:
step 1: the performance of the current transformer is uniformly regulated by standard or specification to be suitable for measuring modules with different precision grade requirements.
Step 2: before the measurement module leaves the factory, the measurement module is calibrated by using a standard source and a current transformer with the precision performance being more than 2 times higher than the precision grade of the measurement module, and the communication address of the measurement module is marked on the measurement module.
Step 3: before the measurement module leaves the factory, the upper limit and the lower limit of the current transformer with the performance parameters uniformly specified by the standard or the specification are respectively subjected to performance test.
Step 4: and in the installation site, a new measuring module is inserted or replaced, and the measuring module is inserted and used at the same time, so that the site replacement of the measuring module is completed.
P is the actual power, U is the actual voltage, I is the actual current,for the actual power factor, then:
if it is assumed that the ratio difference and the angle difference between the detected voltage and the actual voltage and the error caused by the measurement module are not considered, the detected power is:
P 1 to detect power, I 1 In order to detect the current flow,to detect the power factor.
The influence of the current transformer on the power is that
Delta is the angular difference of the current transformers, and e is the ratio difference of the current transformers.
If the power factor is 1.0, the ratio difference is +0.1% and the angle difference is 6', the formula (4) delta= [ (1+0.001) (cos 0.1-tan 0 sin 0.1) -1 ]. Times.100%
The following is obtained:
Δ≈0.0998％
if the power factor is 1.0, the ratio difference is-0.1% and the angle difference is 6', the formula is introduced
Δ＝[(1-0.001)*(cos0.1-tan 0*sin0.1)-1]*100％
The following is obtained:
Δ≈-0.1001％
if the power factor is 0.5L, the ratio difference is +0.1% and the angular difference is 6', the formula is introduced
Δ＝[(1+0.001)*(cos0.1-tan 60*sin0.1)-1]*100％
The following is obtained:
Δ≈-0.2％
if the power factor is 0.5L, the ratio difference is-0.1% and the angle difference is 6', the formula is introduced
Δ＝[(1-0.001)*(cos0.1-tan 60*sin0.1)-1]*100％
The following is obtained:
Δ≈-0.4％
if the power factor is 0.5C, the ratio difference is +0.1 percent, the angle difference is 6', and the formula is introduced
Δ＝[(1+0.001)*(cos0.1-tan 300*sin0.1)-1]*100％
The following is obtained:
Δ≈0.4％
if the power factor is 0.5C, the ratio difference is-0.1%, the angle difference is 6', and the formula is introduced
Δ＝[(1-0.001)*(cos0.1-tan 300*sin0.1)-1]*100％
The following is obtained:
Δ≈0.2％
according to the formula, when the ratio difference is positively biased, under the condition of the same angle difference, the accuracy is higher, and when the capacitive load is reversely loaded, most of scene loads are actually inductive loads, so that the condition of the positive bias of the ratio difference is recommended, and because the accuracy requirements of an ammeter on the power factors of 0.5L and 0.8C are the same, a current transformer with the positive bias of the ratio difference is adopted based on the conditions.
The current transformer has different grades and the comparison difference is regulated, so the number of turns of the current transformer is required to be in a proper range, and positive deviation is made under the condition of meeting the comparison difference requirement.
From the perspective of the production process of the transformer, the value of the nanocrystalline material Bs reaches about 1.2T, as shown in fig. 3, the initial magnetic permeability is high, and the nanocrystalline material is treated by a transverse magnetic field, so that the stability of the magnetic permeability of the material is further improved, and the coercive force is reduced; the manufactured transformer has the advantages of small volume, high precision, good consistency and the like.
The nanocrystalline magnetic ring is subjected to vacuum heat treatment firstly, and then transverse magnetic field heat treatment is performed under proper temperature conditions, so that the magnetic permeability stability of the material can be improved, and the current transformer manufactured by the magnetic ring has the characteristics of high precision, the ratio error of the transformer can be less than 0.05%, the angle difference variation is small, and the calibration is convenient.
The nanocrystalline material is generally crystallized at about 510 ℃ and the Curie temperature is above 560 ℃, so that the magnetic ring has very stable low-high-low temperature performance, and the current transformer manufactured by the nanocrystalline material magnetic core has wide working temperature range and good temperature stability at-40 ℃ to +85 ℃, as shown in figure 4.
Referring to fig. 5, a system flow chart of the present embodiment is shown.
Thus, the measurement module does not need to be powered down to support hot plug. The problem of on-site current transformer and measurement module matching calibration is solved. Quick replacement, plug and play. The current transformer has high performance and high consistency. And actively reporting the replacement information.
Optionally, the performance parameter of the current transformer comprises the actual power of the current transformer; the actual power of the current transformer is determined according to the following formula:
p is the actual power, U is the actual voltage, I is the actual current,is the actual power factor.
Optionally, the performance parameters of the current transformer further include an influence of the current transformer on power; the impact of the current transformer on power is determined according to the following formula:
delta is the influence of the current transformer on the power, delta is the angular difference of the current transformer, and e is the ratio difference of the current transformer.
The invention provides the influence on the precision of the split measuring module on the parameter performance of the current transformer, and compared with the prior art, the invention has the following beneficial effects: the measurement module does not need to be powered off to support hot plug. The problem of on-site current transformer and measurement module matching calibration is solved. Quick replacement, plug and play. The current transformer has high performance and high consistency. And actively reporting the replacement information.
In accordance with another aspect of the present embodiment, a system 600 for improving the performance parameters and consistency of current transformers is also provided. The system 600 includes: a specified performance parameter module 610, configured to uniformly specify performance parameters of the current transformer; a calibration measurement module 620, configured to calibrate a measurement module by using a standard source and a current transformer with accuracy performance higher than a predetermined multiple of the accuracy level of the measurement module, and identify a communication address of the current transformer in the measurement module; the upper and lower limit parameter testing module 630 is used for performing performance testing on the upper limit parameter and the lower limit parameter of the current transformer which are uniformly regulated by the performance parameters; the replacement measurement module 640 is inserted for inserting or replacing the measurement module, and field replacement of the measurement module is completed.
Optionally, the performance parameter of the current transformer comprises the actual power of the current transformer; the actual power determination submodule is used for determining the actual power of the current transformer according to the following formula:
p is the actual power, U is the actual voltage, I is the actual current,is the actual power factor.
Optionally, the performance parameters of the current transformer further include an influence of the current transformer on power; the determining influence submodule is used for determining the influence of the current transformer on the power according to the following formula:
delta is the influence of the current transformer on the power, delta is the angular difference of the current transformer, and e is the ratio difference of the current transformer.
A system 600 for improving performance parameters and consistency of a current transformer according to an embodiment of the present invention corresponds to a method 100 for improving performance parameters and consistency of a current transformer according to another embodiment of the present invention, and is not described herein.
It will be appreciated by those skilled in the art that embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The solutions in the embodiments of the present application may be implemented in various computer languages, for example, object-oriented programming language Java, and an transliterated scripting language JavaScript, etc.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (6)
1. A method for improving performance parameters and consistency of a current transformer, comprising:
the method comprises the steps of uniformly prescribing performance parameters of a current transformer;
calibrating a measurement module by using a standard source and a current transformer with the precision performance higher than the precision grade of the measurement module by a preset multiple, and marking the communication address of the current transformer in the measurement module;
performing performance test on upper limit parameters and lower limit parameters of the current transformer which are uniformly regulated by the performance parameters;
and inserting or replacing the measuring module to complete the field replacement of the measuring module.
2. The method of claim 1, wherein the step of determining the position of the substrate comprises,
the performance parameters of the current transformer comprise the actual power of the current transformer;
the actual power of the current transformer is determined according to the following formula:
p is the actual power, U is the actual voltage, I is the actual current,is the actual power factor.
3. The method of claim 2, wherein the step of determining the position of the substrate comprises,
the performance parameters of the current transformer also comprise the influence of the current transformer on the power;
the impact of the current transformer on power is determined according to the following formula:
delta is the influence of the current transformer on the power, delta is the angular difference of the current transformer, and e is the ratio difference of the current transformer.
4. A system for improving performance parameters and consistency of a current transformer, comprising:
the specified performance parameter module is used for uniformly specifying the performance parameters of the current transformer;
the calibration measurement module is used for calibrating the measurement module by utilizing a standard source and a current transformer with the precision performance higher than the precision grade of the measurement module by a preset multiple, and identifying the communication address of the current transformer in the measurement module;
the upper and lower limit parameter testing module is used for performing performance testing on upper limit parameters and lower limit parameters of the current transformer which are uniformly regulated by the performance parameters;
and inserting a replacement measurement module for inserting or replacing the measurement module to complete the field replacement of the measurement module.
5. The system of claim 4, wherein the system further comprises a controller configured to control the controller,
the performance parameters of the current transformer comprise the actual power of the current transformer;
the actual power determination submodule is used for determining the actual power of the current transformer according to the following formula:
p is the actual power, U is the actual voltage, I is the actual current,is the actual power factor.
6. The system of claim 5, wherein the system further comprises a controller configured to control the controller,
the performance parameters of the current transformer also comprise the influence of the current transformer on the power;
the determining influence submodule is used for determining the influence of the current transformer on the power according to the following formula:
delta is the influence of the current transformer on the power, delta is the angular difference of the current transformer, and e is the ratio difference of the current transformer.
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